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The following relational database schema represents part of a simplified database used by a library:
tblBook (BookID, Title, PublisherID, Category,Price) tblPublisher (PublisherID, PublisherName,PublisherCity) tblAuthor (AuthorID, AuthorName, AuthorCity) tblBookAuthor (BookID, AuthorID)
a) Draw an ERD for the above relational schema.
b) Write SQL statements to perform the following queries.
i) List the title and price of all books with category 'Database' sorted in alphabetical order of title and ascending order of price ii) List the categories and the average price of a book in each category. iii) List the title and category of the most expensive book. iv) List the title and price of all 'Internet' books published by 'McGraw-Hill'. v) List the author who has written the most expensive book.
Funky Festivals Specification Funky Festivals organise music festivals which take place at various venues throughout the UK. A venue needs to be booked before a Festival can t
Define check point and its impact on data base recovery. Ans: There could be hundreds of transactions handled per minute, in a large on-line database system.
define normalisation and functional dependency
In a relation, tuples are not inserted in any definite order. Ordering of tuples is not defined as a part of a relation definition. Though, records may be structured later accordin
Consider the subsequent relations for a database which keeps track of business trips of salespersons in a sales office: SALESPERSON (SSN, Name, start_year, Dept_no) TRIP (SSN, Fr
Single-Valued Dependencies A database is a collection of related information and it is therefore inevitable that some items of information in the database would depend on some
what is RDBMS? how it works? good example.
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
atient(PNumber, Name, NHS_no, Amount_due, DNO, Doctor, Medical_Treatment), relation of schema Staff(StaffNum, Name, DNO, Task) and relation of schema Dept(DNO, Name, Location, Dire
Question 1 Explain the functions of the following Storage Manager Buffer Manager Transaction Manager 2 Discuss about system catalog in a relational DBMS 3
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